Chemistry in Environment

What is the enhanced greenhouse effect?

• The process where increased concentrations of greenhouse gases in the atmosphere trap more thermal energy, causing the Earth's average temperature to rise.

• A phenomenon where the ozone layer becomes thicker, leading to cooler temperatures on Earth.

• The natural process of heat retention by the Earth's surface without any human influence.

• A method of reducing carbon emissions by planting more trees.

What is global warming?

• A decrease in Earth's average temperature due to reduced greenhouse gases in the atmosphere.

• The rise in Earth's average temperature due to increased concentrations of greenhouse gases in the atmosphere.

• A natural phenomenon that has no impact on climate change.

• The cooling of the Earth's surface caused by human activities.

What are two main greenhouse gases? (Extended Tier Only)

• Carbon dioxide and methane

• Oxygen and nitrogen

• Hydrogen and helium

• Sulfur dioxide and ozone

True or False?

Catalytic converters in vehicles are used to remove sulfur dioxide.

• True

• False

• They remove carbon dioxide

• They remove particulate matter

What is flue gas desulfurisation?

• A process to increase sulfur dioxide emissions.

• A method to reduce sulfur dioxide emissions by spraying waste gases with a slurry of calcium compounds.

• A technique for capturing carbon dioxide from the atmosphere.

• A process used to purify water in power stations.

State two consequences of global warming.

• Climate change and water levels will rise

• Migration of species and increase in biodiversity

• Spread of diseases and decrease in food production

• Loss of habitat and improved air quality

True or False?

Carbon monoxide is produced by complete combustion of fossil fuels.

• True

• False

• Only in certain conditions

• Only from natural gas

What is acid rain?

• Rainwater that has become acidic due to dissolved pollutants such as oxides of nitrogen and sulfur dioxide.

• Rainwater that is always acidic regardless of pollutants.

• Rainwater that is beneficial for plant growth.

• Rainwater that has a higher temperature than normal.

State the equation for the reaction of nitrogen monoxide and carbon monoxide in a catalytic converter.

• 2NO + CO → N2 + CO2

• 2NO + 2CO → N2 + 2CO2

• NO + CO → N2 + CO2

• 2NO + 3CO → N2 + 3CO2

What are the two main gases in the atmosphere?

• Nitrogen and Oxygen

• Carbon Dioxide and Helium

• Hydrogen and Argon

• Methane and Neon